std::string::resize() in C++
Last Updated :
05 Sep, 2022
resize() lets you change the number of characters. Here we will describe two syntaxes supported by std::string::resize() in C++ Return Value : None
Syntax 1: Resize the number of characters of *this to num.
void string ::resize (size_type num)
num: New string length, expressed in number of characters.
Errors:
Throws length_error if num is equal to string ::npos.
Throws length_error if the resulting size exceeds the maximum number of
characters(max_size()).
Note : If num > size() then, the rest of characters are initialized by the ‘\0’.
CPP
#include <iostream>
#include <string>
using namespace std;
void resizeDemo(string str)
{
str.resize(5);
cout << "Using resize : ";
cout << str;
}
int main()
{
string str("GeeksforGeeks ");
cout << "Original String : " << str << endl;
resizeDemo(str);
return 0;
}
|
Output:
Original String : GeeksforGeeks
Using resize : Geeks
Syntax 2: Uses a character to fill the difference between size() and num.
void string ::resize (size_type num, char c )
num: is the new string length, expressed in number of characters.
c: is the character needed to fill the new character space.
If num > size() : character c is used to fill space.
If num < size() : String is simply resized to num number of characters.
Errors:
Throws length_error if num is equal to string ::npos.
Throws length_error if the resulting size exceeds the maximum number of
characters(max_size()).
CPP
#include <iostream>
#include <string>
using namespace std;
void resizeDemo(string str)
{
cout << "Using resize :" << endl;
cout << "If num > size() : ";
str.resize(15, '$' );
cout << str << endl;
cout << "If num < size() : ";
str.resize(5, '$' );
cout << str;
}
int main()
{
string str("GeeksforGeeks");
cout << "Original String : " << str << endl;
resizeDemo(str);
return 0;
}
|
Output:
Original String : GeeksforGeeks
Using resize :
If num > size() : GeeksforGeeks$$
If num < size() : Geeks
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